I know that is what is documented online but it totally works. There was one consistent problem in which D mode would not downshift on the freeway beyond 1 gear. every single time. Did this and now it warps down to 3rd or 4th from 75 mph just like its supposed to. Felt more crisp in all shifts when doing D. I am a believer.
I alsmost pulled trigger on ESS dct tune to rid this but glad i trtied this fix first as i lov everthing about the dct.
If you have an older m3 with older software than you need the dealer to literally upgrade the software. i